Let's eat lunch outdoors today.
野外コンサートは雨で中止になった。
The open-air concert was canceled due to rain.
Refers to open land, fields, or the outskirts of a town, often implying a natural or less-developed area. Less common than the 'outdoors' sense.
彼は都会を離れ、野外で農業を始めた。
He left the city and started farming in the fields.
We decided to hold the wedding outdoors.
When we left the city and went out into the open country, quiet nature spread before us.
We enjoyed a barbecue outdoors with the family.
field research; field survey; field investigation
public exhibitionism; indecent exposure outdoors